Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 8, Issue 10, 18 May 1972
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Volume 8, Issue 10
18 May 1972
Lateral displacement of log-periodic paraboloid feed
- Author(s): P.A. McInnes ; E.W. Munro ; A.J.T. Whitaker
- Source: Electronics Letters, Volume 8, Issue 10, p. 249 –250
- DOI: 10.1049/el:19720184
- Type: Article
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p.
249
–250
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The combined effect of lateral and axial displacement of the feed phase centre on the secondary performance of a parabolic reflector is described, with particular reference to a log-periodic dipole-array feed. Computed and experimental results are presented.
Improved method for calculation of Fourier coefficients of a function given at a set of arbitrary points
- Author(s): R. Piessens
- Source: Electronics Letters, Volume 8, Issue 10, p. 250 –251
- DOI: 10.1049/el:19720185
- Type: Article
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p.
250
–251
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A recently published method for the calculation of Fourier coefficients of a function given at a discrete set of arbitrary points is improved. The function is approximated by a sum of Legendre polynomials, rather than by Cheby̅shev polynomials. The Fourier coefficients are then readily expressed in terms of spherical Bessel functions.
Waveguide analysis by random walks
- Author(s): T.R. Rowbotham and P.B. Johns
- Source: Electronics Letters, Volume 8, Issue 10, p. 251 –253
- DOI: 10.1049/el:19720186
- Type: Article
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p.
251
–253
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A new low-storage numerical method for the solution of waveguide problems, based on impulse analysis, is introduced. This is the random-walk technique, which eliminates the need for processing large matrices by recognising that not all the information available is necessary for a given accuracy of solution. The results of a feasibility study into the use of the method are presented.
Spectra of digital f.m. after filtering and hard limiting
- Author(s): T.J. Baker
- Source: Electronics Letters, Volume 8, Issue 10, p. 253 –254
- DOI: 10.1049/el:19720187
- Type: Article
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253
–254
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An expression is given for the power spectrum of a digital f.m. signal which has been passed through a combination of filter and hard limiter.
Computer study of submicrometre f.e.t.s
- Author(s): M. Reiser and P. Wolf
- Source: Electronics Letters, Volume 8, Issue 10, p. 254 –256
- DOI: 10.1049/el:19720188
- Type: Article
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The electrical properties of f.e.t.s with submicrometre gates are investigated by means of a 2-dimensional computer model. It is found that the gain-bandwidth product increases with decreasing gate length and reaches a value of 70 GHz for 0.1 μm gates. This improvement is, however, at the expense of open-circuit voltage gain. A practical limit of the gate length for useful devices is found to be about 0.1 μm.
Digital linear interpolator
- Author(s): J.P. Chambers
- Source: Electronics Letters, Volume 8, Issue 10, p. 256 –257
- DOI: 10.1049/el:19720189
- Type: Article
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p.
256
–257
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A substitution is made in the linear-interpolation function A(1−S)+B.S. This effectively halves the number of partial products in the binary expansion. The corresponding digital logic is an adaptation of a single multiplier.
Determination of a nonlinear parameter for acoustic-surface-wave convolution in LiNbO3
- Author(s): E. Bridoux ; M. Moriamez ; J.M. Rouvaen ; E. Dieulesaint
- Source: Electronics Letters, Volume 8, Issue 10, p. 257 –258
- DOI: 10.1049/el:19720190
- Type: Article
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257
–258
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A 1-dimensional, single-parameter model is used to calculate the voltage induced by two acoustic surface waves propagating in opposite directions in a nonlinear material. A value of the single parameter for LiNbO3 is found to be K = 8±3 C/m2 from experiment at 150 MHz.
Theoretical calculations on the effect of temperature on the operation of an IMPATT diode
- Author(s): J.R. Grierson
- Source: Electronics Letters, Volume 8, Issue 10, p. 258 –260
- DOI: 10.1049/el:19720191
- Type: Article
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p.
258
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An accurate small-signal analysis has been used to explain recently published experimental results on the effect of junction temperature on the operation of an IMPATT diode. Utilisation of temperature-dependent velocities and ionisation coefficients gives results differing from simple theory, but allowing qualitative agreement with experimental findings.
Propagation model for multimode optical-fibre waveguide
- Author(s): W.A. Gambling ; J.P. Dakin ; D.N. Payne ; H.R.D. Sunak
- Source: Electronics Letters, Volume 8, Issue 10, p. 260 –262
- DOI: 10.1049/el:19720192
- Type: Article
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–262
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Pulse dispersions of 5 ps/m have been measured in cladded-glass and liquid-core multimode fibres. A theoretical model is proposed which gives excellent agreement with measured propagation delay and pulse dispersion. In the fibres used, there is little light scattering either in the core or at the core-cladding interface.
Novel mode filter for use with cladded-glass and liquid-core optical waveguides
- Author(s): W.A. Gambling ; J.P. Dakin ; D.N. Payne ; H.R.D. Sunak
- Source: Electronics Letters, Volume 8, Issue 10, p. 262 –263
- DOI: 10.1049/el:19720193
- Type: Article
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Two methods of filtering off high-order modes in multimode fibres are proposed. One uses a periodic sequence of apertures and the other involves continuous coupling. In this way, it may be possible to achieve bandwidths approaching 100 MHz over kilometre lengths.
Outline designs for stable continuous-time fixed-lag smoothers
- Author(s): S. Chirarattananon and B.D.O. Anderson
- Source: Electronics Letters, Volume 8, Issue 10, p. 263 –264
- DOI: 10.1049/el:19720194
- Type: Article
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263
–264
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Three basic methods for constructing suboptimal continuous-time linear fixed-lag smoothers are described. In contrast to the optimal smoother, all the suboptimal smoothers are stable. The degree of complexity allowed in the suboptimal smoothers determines how closely they perform to the limit obtainable from the theoretical optimal linear fixed-lag smoother.
Prebreakdown current and charge flow in long positive point-plane gaps with impulse-voltage waves having times to crest in the range 15–1200 μs
- Author(s): B. Jones and H.W. Whittington
- Source: Electronics Letters, Volume 8, Issue 10, p. 264 –265
- DOI: 10.1049/el:19720195
- Type: Article
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p.
264
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Measurements of prebreakdown current and charge flow in long positive point-plane gaps have shown a critical charge injection which is a function of time to peak of the voltage wave. With increasing time to peak, the pattern of current flow changes from a single large-amplitude pulse to a series of discrete pulses of lower amplitude but of similar duration.
Rayleigh-wave delay line using two grating-array transducers at 2.55 GHz
- Author(s): P. Hartemann and C. Arnodo
- Source: Electronics Letters, Volume 8, Issue 10, p. 265 –267
- DOI: 10.1049/el:19720196
- Type: Article
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Grating-array transducers are used to launch acoustic surface waves at 2.55 GHz on a LiNbO3 substrate. The insertion loss of a 1.5 μs delay line is equal to 39 dB with matching stubs at input and output. The 3 dB bandwidth is equal to 87 MHz. For this frequency range, array transducers are easier to fabricate than standard interdigital transducers. Performances of the two types of transducers are compared.
Properties of the generalised inverse matrix in the electrical-network problem
- Author(s): H. Nicholson
- Source: Electronics Letters, Volume 8, Issue 10, p. 267 –268
- DOI: 10.1049/el:19720197
- Type: Article
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p.
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A modified form of Roth's transformation diagram for a linear graph is used to illustrate the solution of the electrical-network problem. The diagram illustrates particularly the significance of the orthogonal projections of the branch space into the branch voltage and current subspaces, which are defined by Kirchhoff's laws, and also the existence of the constrained matrix inverse which forms a basis for the solution of the electrical-network problem. Properties of the generalised inverse matrix are also discussed in relation to the network problem.
Transformations of linear-graph theory in multivariable-system problems
- Author(s): H. Nicholson
- Source: Electronics Letters, Volume 8, Issue 10, p. 268 –270
- DOI: 10.1049/el:19720198
- Type: Article
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p.
268
–270
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A correspondence is established between the multimachine power system, the multivariable control system and the classical least-squares problem incorporating a priori information. A transformation diagram is developed to illustrate the relationships between the system variables, which are similar to those associated with a linear graph or electrical network.
Open terminations for periodic structures
- Author(s): Yves Garault and Bernard Jecko
- Source: Electronics Letters, Volume 8, Issue 10, p. 270 –271
- DOI: 10.1049/el:19720199
- Type: Article
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This letter presents the results of a study of open terminations of a cylindrical waveguide periodically loaded by metallic irises. To interpret and explain the action of these open terminations on the resonance modes of the periodic cavities, a systematic study of the dimensions influence on resonant frequency, mode configuration and quality factor has been undertaken.
High-efficiency operation of transferred-electron devices in the hybrid mode
- Author(s): H.C. Huang ; R.E. Enstrom ; S.Y. Narayan
- Source: Electronics Letters, Volume 8, Issue 10, p. 271 –273
- DOI: 10.1049/el:19720200
- Type: Article
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–273
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Efficiencies up to 22% at peak-power levels of 60 W in X band have been obtained with transferred-electron devices. These efficiencies are in good agreement with values computed from hybrid-mode theory. A waveguide circuit which permits independent adjustment of the resistive and reactive components of the circuit impedance at the device-package terminals is described. This circuit provides a match for devices with widely different impedances. The close agreement between the theoretical and experimental values of efficiency indicate that both high material quality and an optimum impedance match between the device and the circuit have been achieved.
Attenuation in wall-impedance waveguides: a new approach
- Author(s): G. Falciasecca ; G.M. Prandi ; C.G. Someda
- Source: Electronics Letters, Volume 8, Issue 10, p. 273 –274
- DOI: 10.1049/el:19720201
- Type: Article
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273
–274
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The Rayleigh-Schroedinger power expansion of perturbed eigenvalues is used to determine propagation constants in wall-impedance waveguides, the final objective being a design procedure for trunk-communication waveguides. Examples of applications, where corrections up to the fifth order are accounted for, include ideal helix waveguides and thickly dielectric-lined circular waveguides.
Measurements of s.h.f. tropospheric fading along Earth-space paths at low elevation angles
- Author(s): K.S. McCormick and L.A. Maynard
- Source: Electronics Letters, Volume 8, Issue 10, p. 274 –276
- DOI: 10.1049/el:19720202
- Type: Article
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Measurements have been made at Ottawa, Canada of the amplitude fluctuations which occur when s.h.f. signals are propagated through the troposphere at low elevation angles. At a frequency of 7.3 GHz, it was found that, for elevation angles below 3°, fades greater than 6 dB and 10 dB occurred in the winter and summer months, respectively, for 0.1% of the time.
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